“Alright, Hicks, Hudson, use your motion trackers.”
―Lt. Gorman, to Cpl. Hicks and Pvt. Hudson (from Aliens)
The M314 Motion Tracker, also known as the Motion Scanner, was a simple motion-detecting surveillance device. Essentially, it was a high-powered ultrasound scanner that used doppler-shift discrimination to filter out moving objects from stationary background and then displayed them on the M314’s monitor as a series of contours of probable loci.
Although originally designed for use by rescue and police services, it went on to find use by the United States Colonial Marine Corps, who issued it as standard equipment as part of their Smartgun teams.
A moving object was shown on the M314 Motion Tracker’s display as a series of contours of probable loci, with the range and bearing given to the target. Motion Trackers were often employed for perimeter surveillance, able to monitor movements of small animal-sized targets up to a range of 1,000 meters in open country. The greatest advantage of the Motion Tracker was its ability to scan through objects; however, intervening terrain could cut this detection range quite drastically and, in built-up areas, the presence of walls and partitions could reduce the range to less than 20 meters.
While a powerful tool, Motion Tracker operators had to become familiar with the device’s limitations. Primarily, it was incapable of differentiating between different sources of movement — an approaching hostile target would register just the same as moving machinery in the environment (although the Motion Tracker’s range gate function was calibrated to reject small or slight movements, such as bugs crawling, plants waving in the wind, etc.). While Colonial Marines were equipped with an Identification Friend Foe (IFF) transponder as part of their armor, designed to render them “immune” to the Motion Trackers carried by the USCM and thereby preventing false detection of friendly personnel, this technology was liable to malfunction on occasion. The M314 also had a limited field of vision, and would only detect movement in the direction it is pointed, leaving large areas unchecked, particularly to the rear.
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